Crepe fabric and method of making the same



Patented July 7, 1931 UNITEDfS TATES CREEE FABRIC AND METHOD 0]? MAKING THE SAME No Drawing.

This invention relates to the preparation of crepe fabrics having yarns of-natural silk and yarns of artificial filaments containing organic esters of cellulose. A

This application is in part a continuation of my co-pending application No. 317,126 filed November 3, .1928. An object of my invention is to produce crepe fabrics having both yarns of natural silk and yarns of organic esters of cellulose therein, wherein the yarns of the organic esters of cellulose have 'a natural lustre or sheen. Other objects of my invention will appear from the following detailed description. In the manufacture of crepe fabrics containing natural silk,-the practice has hereto- -finished, the yarns of the organic derivatives of cellulose lose some of their lustreland sheen in the process of boiling off the fabric to remove the gum from the natural 'silk, even if the degumming of the silk is carried out at comparatively low temperatures, say for instance 80? C.v .Since such fabrics depend so much for their beauty on the sheen of the yarn, the preservation of this sheen is of great importance. I have found that contrary to the general view, natural silk yarn of the required twist, but degummed, maybe woven into a fabric, and when this fabric is treated with an aqueous'bath or other creping bath, a crepe fabric is produced.

' In accordance with myvinvention I prepare a crepe fabric from yarns of organic deriva tives' of cellulose that are "aptto become delustered when boiled with water-or aqueous liquids and natural silk yarn from which the gum has been previously removed to the extent required for the particular case.

- The organic derivatives of cellulose employed for making the yarn may be any suit- PATENT? OFFICE Application filed April 12, 15529. Serial No. 354,710.

able ones such as cellulose ethers, but the greatest advantages accrue from the use of yarns containing organic esters of cellulose. Examples of organic esters of'cellulose are cellulose acetate, cellulose formate, cellulose propionate and cellulose butyrate, while examples of cellulose ethers are ethyl cellulose, methyl cellulose and benzyl 'celluose; These yarns may be associated with yarns of other materials such as cotton, wool or flax.

As stated, the silk yarn to be used in mak- I ing the crepe fabric is first degummed to the desired extent prior to Weaving. This degumming process may be anysuitable one such as by boiling in water or aqueous solutions or in alkaline solutions or in any other suitable baths as desired: The silk yarn has imparted thereto a high twist, say on the order of 50 to 7 5 turns per inch as is well understood in the art. The so degummed and twisted silk yarn which has not been dyed is then associated with the organic derivative of cellulose yarn to form a woven fabric of desired construction. The natural silk yarn may be employed in'either the warp or the weft, or both, and if desired, the high- 1y twisted yarn may be alternated'in rightnot have to be subjected to degumming or boiling off treatment to remove the gum from the silk, there is no danger of the yarns of the organic derivatives of cellulose become ing delustered. By my process therefore, a crepe fabric of the natural beautiful sheen or lustre or organic derivative of cellulose yarn is produced. From the pointof view of economy, my process is of great advantage since the natural silk may be degummed as above described at higher temperatures and in much less time, than if it were attempted to degum such silk when it is associated with organic derivative of cellulose yarn. The crepe fabric made by my invention may be subjected to any desired finishing' treatment such as dyeing, scouring,

printing, etc., as is well understood in the art.

, "While I have described my invention as applied tov the use of highly twisted natural silk yarn that has been degumrned, if desired, a protective size containing glues, starches, gelatin, soaps, Waxes and the like may be applied to the natural silk yarn prior to Weaving. If such sizes are used, they should be of such nature that they are easily removed at comparatively low tempera tures in Water or aqueous soap solutions under such conditions that the lustre of the organic derivative of cellulose yarn is not or is but little affected.

It is to be understood that the foregoing detailed description is givenmerely by way of illustration and that many variations may be made therein Without departing from the spirit of my inventionf Having described my invention, What I claim and desire to secure by Letters Patent is:

1. The method of forming crepe fabric comprising Weaving together yarns of organic derivatives of cellulose and highly twisted degummed undyed natural silk yarn and then subjecting the fabric to a creping bath.

2. The method of forming crepe fabric comprising Weaving together yarns of cellulose acetate and highly twisted degummed undyed natural silk yarn and then subjecting the fabric to a creping bath.

3. Grepe fabric formed-from highly twisted degummed undyed natural silk yarn and yarns of organic derivatives of cellulose.

4. Crepe fabric formed from highly twist ed degummed undyed natural silk yarn and yarns of cellulose acetate.

In testimony whereof, I scribed my name.

have hereunto sub- CAMELLE DREYFUS. 

